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A few days ago Stefano Karapetsas posted an
announcement on the mate-dev mailing list outlining the decision to reshuffle
the MATE Desktop roadmap.

Essentially GTK3 support for MATE has been pushed back to MATE 1.10 because
there is still a good deal of work to be done to get it really stable. Therefore
MATE 1.8 will continue to be based GTK2, although GTK3 applications integrate
nicely just as they did in MATE 1.6. The updated roadmap is available on our wiki:

This decision was made because the current development version of MATE is stable,
incorporates many new features, improvements and bug fixes. We want to get all
that “good stuff” ™ out to our users so they can benefit from the
advancements we’ve made sooner.